www.murata-ps.com
BCP Models
Dual Output, Mixed Voltage, Isolated 5V & 3.3 V,
"Half-Brick" 75 W DC/DC Converters
FEATURES
Independent 5V and 3.3V outputs
Each output fully regulated
No minimum load requirements
Up to 15 Amps per output
75 Watts total output power
Standard "half-brick" package
UL1950, EN60950-1 and VDE safety
approvals (BASIC insulation)
Fully isolated, 1500Vdc guaranteed
18-36V or 36-75V input ranges
CE mark available (75V-input models)
Input under and overvoltage shutdown
Continuous short-circuit protection
Thermal shutdown
PRODUCT OVERVIEW
As your new, mixed-logic (5V and 3.3V) design
evolves and your current requirements change,
your new DC/DC converter will not. Murata Power
Solutions' BCP-5/15-3.3/15-D24 (18-36V input)
and BCP-5/15-3.3/15-D48 (36-75V input) are fully
isolated DC/DC converters providing both 5V and
3.3V outputs. Housed in standard "half-brick"
packages (2.3" x 2.4" x 0.525"), the BCP’s can
support any combination of 5V and 3.3V loading
up to a combined total of 15 Amps. Both outputs
are fully isolated (1500Vdc) and independently line
(±0.2%) and load (±0.5% and ±0.6%) regulated.
Both BCP models feature input pi filters, input
undervoltage and overvoltage shutdown, input
reverse-polarity protection, output overvoltage
protection, current limiting, and thermal shutdown.
Each has an on/off control function, and the two
output voltages can be trimmed independently.
BCP Model DC/DC’s deliver low noise
(50mVp-p), high efficiency (87%) and are fully
specified for –40 to +100°C operation. Utilization of
metal baseplate technology with threaded inserts
permits easy heat-sink attachment and/or pcb
mounting. These devices meet IEC950, UL1950,
EN60950-1 and VDE safety standards, includ-
ing BASIC insulation requirements. CB reports
are available on request. "D48" models are CE
marked (meet the requirements of LVD). Selected
models are available with RoHS-6 hazardous
substance compliance.
SIMPLIFIED SCHEMATIC
+INPUT
(4)
+5V OUTPUT
(7)
SWITCH
CONTROL
5V RETURN (6)
+3.3V OUTPUT
(10)
–INPUT
(1)
MAG AMP
CONTROLLER
REFERENCE &
ERROR AMP
3.3V RETURN
(9)
ON/OFF
CONTROL
(3)
PWM
CONTROLLER
3.3V TRIM
(8)
OPTO
ISOLATION
REFERENCE &
ERROR AMP
UV & OV
COMPARATORS
5V TRIM
(5)
For full details go to
www.murata-ps.com/rohs
Typical topology is shown
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12 Nov 2009
email: sales@murata-ps.com
MDC_BCP_75W.B03
Page 1 of 14
BCP Models
Dual Output, Mixed Voltage, Isolated 5V & 3.3 V,
"Half-Brick" 75 W DC/DC Converters
PERFORMANCE SPECIFICATIONS AND ORDERING GUIDE
c
Output
Model Family
i
BCP-5/15-3.3/15-D24P-C
Input
Regulation (Max.)
Line
±0.2%
±0.2%
±0.2%
±0.2%
V
OUT
(V)
5
3.3
5
I
OUT
g
(A)
15
15
15
15
R/N (mVp-p)
Typ.
50
50
50
50
Max.
100
100
100
100
Load
e
±0.5%
±0.6%
±0.5%
V
IN
Nom.
(V)
24
Range
(V)
18-36
I
IN
f
(mA)
215/3720
Efficiency
h
Min.
84%
Typ.
87.2%
Package
(Case/
Pinout)
C19, P29
BCP-5/15-3.3/15-D48N-C
48
3.3
±0.6%
f
g
h
i
36-75
125/1860
84%
88%
C19, P29
c
Typical at T
A
= +25°C under nominal line voltage and balanced "full-load" (5V @7.5A, 3.3V @ 7.5A)
conditions unless otherwise noted.
d
Ripple/Noise (R/N) measured over a 20MHz bandwidth. All models are specified with 22μF,
low-ESR, input capacitor and 10μF tantalum in parallel with 1μF ceramic output capacitors.
e
No load to 100% load, other output at no-load.
Nominal line voltage, no-load/5V at full-load condition.
Current from either output at maximum value, or both outputs to a combined total of 15 A.
5V at full-load condition.
Please refer to the Part Number Structure for additional options when ordering.
PART NUMBER STRUCTURE
BCP
-
5
/
15
-
3.3
/
15
-
D24 N H LX
-
T
-
C
Dual Output/
Standard Half-Brick
V
1
Nominal Output Voltage:
5V
I
1
Maximum Output Current:
15A
V
2
Nominal Output Voltage:
3.3V
I
2
Maximum Output Current:
15A
Optional Functions:
See also last page
Input Voltage Range:
D24
= 18-36 Volts (24V nominal)
D48
= 36-75 Volts (48V nominal)
RoHS Hazardous
Substance Compliance
Special Trim Versions:
BCP-5/15-3.3/15-D48 only
(Quantity order only)
Optional Functions—Refer
to last page for additional options:
Blank On/Off Control function (positive polarity) pin 3
N
On/Off Control function (negative polarity) pin 3
L1
Pin length: 0.110 in. (2.79mm) ±0.010, quantity order
L2
Pin length: 0.145 in. (3.68mm) ±0.010, quantity order
-Y
RoHS-5 Hazardous substance compliance, with lead
-C
RoHS-6 Hazardous substance compliance, no lead
-H
Conformal Coating (special order):
Blank = no coating, standard
H = coating added, special order
Note:
Some model number
combinations may not be available.
Contact Murata Power Solutions.
www.murata-ps.com
12 Nov 2009
email: sales@murata-ps.com
MDC_BCP_75W.B03
Page 2 of 14
BCP Models
Dual Output, Mixed Voltage, Isolated 5V & 3.3 V,
"Half-Brick" 75 W DC/DC Converters
MECHANICAL SPECIFICATIONS
Optional Heat Sink
(Part Number HS-CPLP2)
2.30
(58.4)
METAL BASEPLATE
3.50
(88.9)
2.00
(50.8)
0.75
(19.1)
0.20
(5.1)
0.545 (13.84) MAX.
0.525 (13.34) TYP.
PLASTIC SHELL
0.20 MIN
(5.1)
1.900
(48.3)
0.040 ±0.002 DIA.
(1.016 ±0.051)
0.20
(5.1)
1.900
(48.3)
2.30
(58.4)
10
1
9
2
8
2.000 1.400
(50.80) (35.56)
1.000
(25.40)
0.400
(10.16)
4
(4) THREADED INSERTS
#M3 THD THRU
7
3
6
5
0.200
(5.08)
BOTTOM VIEW
0.20
(5.08)
0.300
(7.62)
0.600
(15.24)
1.000
(25.40)
1.300
(33.02)
1.600
(40.64)
2.40
(61.0)
0.140 THRU AND COUNTERSINK
90° TO 0.26 (4 PLACES)
MATERIAL: BLACK ANODIZED ALUMINUM
0.16
(4.1)
2.48
(63.0)
0.47
(11.9)
0.30
(7.62)
Optional Heat Sink
(Part Number HS-CP)
2.30
(58.4)
1.900
(48.3)
0.50 (12.70) TYP.
051 (12.95) MAX.
0.20
(5.1)
0.10
(2.5)
Pin
1
2
3
4
5
INPUT/OUTPUT CONNECTIONS
Function
Pin
Function
-Input
Case (Baseplate)
On/Off Control
+Input
5V Trim
6
7
8
9
10
5V Return
+5V Output
3.3V Trim
3.3V Return
+3.3V Output
2.00
(50.8)
2.40
(61.0)
Standard pin length is shown. Please refer to the Part
Number Structure for special order pin lengths.
0.147 DIA. (3.734)
(4 PLACES)
TOP VIEW
0.20
(5.1)
MATERIAL: BLACK ANODIZED ALUMINUM
4 MOUNTING SCREWS AND 0.009 (0.229)
THICK THERMAL PAD INCLUDED
Dimensions are in inches (mm) shown for ref. only.
Third Angle Projection
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only.
www.murata-ps.com
12 Nov 2009
email: sales@murata-ps.com
MDC_BCP_75W.B03
Page 3 of 14
BCP Models
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage, balanced "full-load" conditions, unless noted.
c
Input
Dual Output, Mixed Voltage, Isolated 5V & 3.3 V,
"Half-Brick" 75 W DC/DC Converters
Dynamic Characteristics
Input Voltage Range:
D24 Models
D48 Models
Overvoltage Shutdown:
d
D24 Models
D48 Models
Start-Up Threshold:
d
D24 Models
D48 Models
Undervoltage Shutdown:
d
D24 Models
D48 Models
Input Current:
Normal Operating Conditions
Minimum Input Voltage:
D24 Models
D48 Models
Standby Mode:
Off, OV, UV, Thermal Shutdown
Input Reflected Ripple Current:
Source Impedance <0.1:
22μF Low-ESR Capacitor
Input Filter Type
Reverse-Polarity Protection:
d
D24 Models
D48 Models
On/Off Control:
(Pin 3)
deg
D24 & D48 Models
D24N & D48N" Models
18-36 Volts (24V nominal)
36-75 Volts (48V nominal)
37.5-40.5 Volts (39V typical)
78.8-87.0 Volts (83V typical)
15.5-18 Volts (16.5V typical)
33.5-36 Volts (34.4V typical)
14-16 Volts (15.3V typical)
30.5-33.5 Volts (31.8V typical)
See Ordering Guide
5.02 Amps maximum
2.51 Amps maximum
17mA typical
Dynamic Load Response:
5V (50-100% load step to 1% V
OUT
)
3.3V (50-100% load step to 1% V
OUT
)
Start-Up Time:
d
V
IN
to V
OUT
On/Off to V
OUT
Switching Frequency
450μsec maximum
450μsec maximum
30msec maximum
20msec maximum
350kHz (±35kHz)
Environmental
MTBF
D24 Models
D48 Models
Operating Temperature
(Ambient):
T
Case to Ambient, No Heatsink
(See Derating Curves)
Case Temperature:
Maximum Allowable
For Thermal Shutdown
d
Storage Temperature
Bellcore, ground fixed, controlled
1.49M hours (case @ 50°C)
1.72M hours (case @ 50°C)
6.8°C/Watt
–40 to +85°C with derating
+100°C
+100°C minimum, +110°C maximum
–40 to +120°C
Physical
53mArms, 150mAp-p maximum
Pi (0.47pF - 4.7μH - 3μF)
1 minute duration, 6A maximum
1 minute duration, 4A maximum
On = open or 2.0 - +V
IN
, I
IN
= 50μA max.
Off = 0-0.6V, I
IN
= 1mA max.
On = 0-0.6V, I
IN
= 1mA max.
Off = open or 2.0 - +V
IN
, I
IN
= 50μA max.
Output
Dimensions
Case
(Baseplate) Connection
d
Case Material
Baseplate
Pin Material
Weight
2.3"x2.4" x 0.525" (58.4x61x13.3mm)
Pin 2
Diallyl phthalate, UL94V-0 rated
Aluminum
Gold plate over copper alloy
4.2 ounces (118 grams)
Primary to Secondary Insulation Level
Basic
c
Models are specified at "full load" (5V & 3.3V @ 7.5A), with an external 22μF, low-ESR,
input capacitor and 10μF tantalum in parallel with 1μF ceramic output capacitors.
d
See Technical Notes for details.
e
Devices may be ordered with opposite polarity (pin 3 open = off). See Part Number
Suffixes and Technical Notes for additional information.
f
Output noise may be further reduced with the installation of additional external output
capacitors. See Technical Notes.
g
These signals must be referenced to the input return pin (–V
IN
).
h
Demonstrated MTBF available on request.
Absolute Maximum Ratings
V
OUT
Accuracy
5V Output
3.3V Output
Minimum Loading Per Specification
Ripple/Noise
(20MHz BW)
df
Line/Load Regulation
Efficiency
Trim Range
d
Isolation Voltage:
Input-to-Output
Input-to-Case
Output-to-Case
Isolation Capacitance
Isolation Resistance
Current Limit Inception:
d
5V @ 98% V
OUT
(3.3V no-load)
3.3V @ 98% V
OUT
(5V no-load)
Short Circuit Current:
d
Temperature Coefficient
Overvoltage Protection:
d
5V Output
3.3V Output
±2% maximum
±2% maximum
No load
See Ordering Guide
See Ordering Guide
See Ordering Guide and Efficiency Curves
±10% independent
1500Vdc minimum
1000Vdc minimum
1000Vdc minimum
470pF
100M:
16-20 Amps
16-20 Amps
Constant current 25A, indefinite
±0.02% per °C
Magnetic feedback, latching
6.8 volts
4.5Volts
Input Voltage:
Continuous:
D24 Models
D48 Models
Transient (100msec): D24 Models
D48 Models
40.5 Volts
87 Volts
50 Volts
100 Volts
Input Current must be limited. 1 minute
duration. Fusing recommended.
6 Amps
4 Amps
3.8 Volts, latching
6.2 Volts, latching
Current limited. Devices can withstand
an indefinite output short circuit.
–40 to +120°C
+300°C
Input Reverse-Polarity Protection
d
D24 Models
D48 Models
Output Overvoltage Protection
d
3.3V Outputs
5V Outputs
Output Current
d
Storage Temperature
Lead Temperature
(Soldering, 10 sec.)
These are stress ratings. Exposure of devices to any of these conditions may adversely
affect long-term reliability. Proper operation under conditions other than those listed in the
Performance/Functional Specifications Table is not implied, nor recommended.
www.murata-ps.com
12 Nov 2009
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MDC_BCP_75W.B03
Page 4 of 14
BCP Models
Dual Output, Mixed Voltage, Isolated 5V & 3.3 V,
"Half-Brick" 75 W DC/DC Converters
TECHNICAL NOTES
5V & 3.3V Outputs/Returns
The BCP Series outputs (pins 7 & 10) and returns (pins 6 & 9) are isolated
from the +V
IN
and –V
IN
inputs (pins 4 & 1) via a transformer and opto-coupled
transistors.
The +5V Return (pin 6) and +3.3V Return (pin 9) are connected internal
to the DC/DC converter. Though the returns are common within the DC/DC
converter, the regulating control loop for each output is sensed directly at its
respective output and return pins. In order to maintain optimum regulation if
ground plane is not used, it is critical that PC board layouts also return each
output to its corresponding return pin.
Filtering and Noise Reduction
All BCP DC/DC Converters achieve their rated ripple and noise specifications
using the external input and output capacitors specified in the Performance/
Functional Specifications table. In critical applications, input/output noise may
be further reduced by installing additional external I/O caps. Input capacitors
should be selected for bulk capacitance, low ESR and high rms-ripple-current
ratings. Output capacitors should be selected for low ESR and appropriate
frequency response. All caps should have appropriate voltage ratings and be
mounted as close to the converters as possible.
The most effective combination of external I/O capacitors will be a function
of your particular load and layout conditions. Our Applications Engineers will
be pleased to recommend potential solutions and can discuss the possibility of
our modifying a device’s internal filtering to meet your specific requirements.
Contact our Applications Engineering Group for additional details.
Input Fusing
Certain applications and/or safety agencies may require the installation of fuses
at the inputs of power conversion components. Fuses should also be used if
the possibility of sustained, non-current-limited, input-voltage polarity reversals
exists. For BCP DC/DC Converters, you should use fast-blow type fuses with
values no greater than the following.
Fuse Value
V
IN
Range
"D24" Models
6 Amps
"D48" Models
4 Amps
Fuses should be installed in the +Input line.
Input Overvoltage/Undervoltage Shutdown and Start-Up Threshold
Under normal start-up conditions, devices will not begin to regulate until the
ramping-up input voltage exceeds the Start-Up Threshold Voltage (35V for
"D48" models). Once operating, devices will not turn off until the input voltage
drops below the Undervoltage Shutdown limit (32V for "D48" models). Subse-
quent re-start will not occur until the input is brought back up to the Start-Up
Threshold. This built-in hysteresis prevents any unstable on/off situations from
occurring at a single voltage.
Input voltages exceeding the input overvoltage shutdown specification
listed in the Performance/Functional Specifications will cause the device to
shutdown. A built-in hysteresis (2V typical for "D24" models, 4V typical for
"D48" models) will not allow the converter to restart until the input voltage is
sufficiently reduced.
Start-Up Time
The V
IN
to V
OUT
start-up time is the interval between the time at which a ramp-
ing input voltage crosses the turn-on threshold point and the fully-loaded
output voltage enters and remains within its specified accuracy band. Actual
measured times will vary with input source impedance, external input capaci-
tance, and the slew rate and final value of the input voltage as it appears to the
converter.
The On/Off to V
OUT
start-up time assumes the converter has its nominal
input voltage applied but is turned off via the On/Off Control. The specification
defines the interval between the time at which the converter is turned on and
the fully loaded output voltage enters and remains within its specified accuracy
band.
On/Off Control (Standard feature)
The On/Off Control (pin 3) may be used for remote on/off operation. As shown
in Figure 1A, the control pin is referenced to the –Input (pin 1) and will be
pulled to a high state internally. The standard BCP converter (no suffix) is
designed so that it is enabled when the control pin is left open and disabled
when the control pin is pulled low (to less than +0.6V relative to –Input).
Dynamic control of the on/off function is best accomplished with a mechani-
cal relay or an open-collector/open-drain drive circuit (optically isolated if
appropriate). The drive circuit should be able to sink approximately 1mA for
logic low.
The on/off control function is designed such that the converter can be
disabled (pin 3 pulled low for no-suffix models) while input power is ramping
up and then "released" once the input has stabilized.
For BCP converters configured with the negative-polarity option on the
On/Off Control pin ("N" suffix added to part number), operation is opposite to
that described above. The converter is disabled when the On/Off Control pin is
left open and enabled when pulled low.
4
+INPUT
21k
3.3V
4
+INPUT
100k
3
ON/OFF
CONTROL
3
ON/OFF
CONTROL
1
–INPUT
1
–INPUT
Figure 1A. No Suffix
Figure 1B. "N" Suffix
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12 Nov 2009
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MDC_BCP_75W.B03
Page 5 of 14
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